Medium and Heavy Trucks
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Hi my name is***** is the year make and model truck and engine make and model? what do you have for fault codes logged in the ECM?
ECM = Electronic control module... The ECM is what puts it in limp mode and stores fault codes. does the check engine light come on?
You do have an ECM. That is the computer that turns on your engine light. It means there are fault codes logged. You will need a scan tool to retrieve the codes. the codes will tell us what circuit has a problem causing the derate in power or as you say limp mode. Let me know